7 files changed, 147 insertions, 170 deletions

diff --git a/arch/arc/kernel/Makefile b/arch/arc/kernel/Makefile
index 8004b4fa6461..113f2033da9f 100644
--- a/arch/arc/kernel/Makefile
+++ b/arch/arc/kernel/Makefile
@@ -16,7 +16,7 @@ obj-$(CONFIG_MODULES)			+= arcksyms.o module.o
 obj-$(CONFIG_SMP)                       += smp.o
 obj-$(CONFIG_ARC_DW2_UNWIND)            += unwind.o
 obj-$(CONFIG_KPROBES)                   += kprobes.o
-obj-$(CONFIG_ARC_MISALIGN_ACCESS)       += unaligned.o
+obj-$(CONFIG_ARC_EMUL_UNALIGNED)        += unaligned.o
 obj-$(CONFIG_KGDB)                      += kgdb.o
 obj-$(CONFIG_ARC_METAWARE_HLINK)        += arc_hostlink.o
 obj-$(CONFIG_PERF_EVENTS)               += perf_event.o
diff --git a/arch/arc/kernel/disasm.c b/arch/arc/kernel/disasm.c
index b8a549c4f540..3b7cd4864ba2 100644
--- a/arch/arc/kernel/disasm.c
+++ b/arch/arc/kernel/disasm.c
@@ -15,7 +15,7 @@
 #include <linux/uaccess.h>
 #include <asm/disasm.h>
 
-#if defined(CONFIG_KGDB) || defined(CONFIG_ARC_MISALIGN_ACCESS) || \
+#if defined(CONFIG_KGDB) || defined(CONFIG_ARC_EMUL_UNALIGNED) || \
         defined(CONFIG_KPROBES)
 
 /* disasm_instr: Analyses instruction at addr, stores
@@ -535,4 +535,4 @@ int __kprobes disasm_next_pc(unsigned long pc, struct pt_regs *regs,
         return instr.is_branch;
 }
 
-#endif /* CONFIG_KGDB || CONFIG_ARC_MISALIGN_ACCESS || CONFIG_KPROBES */
+#endif /* CONFIG_KGDB || CONFIG_ARC_EMUL_UNALIGNED || CONFIG_KPROBES */
diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S
index 4d2481bd8b98..b0e8666fdccc 100644
--- a/arch/arc/kernel/head.S
+++ b/arch/arc/kernel/head.S
@@ -91,16 +91,6 @@ stext:
         st      r0, [@uboot_tag]
         st      r2, [@uboot_arg]
 
-        ; Identify if running on ISS vs Silicon
-        ;       IDENTITY Reg [ 3  2  1  0 ]
-        ;       (chip-id)      ^^^^^            ==> 0xffff for ISS
-        lr      r0, [identity]
-        lsr     r3, r0, 16
-        cmp     r3, 0xffff
-        mov.z   r4, 0
-        mov.nz  r4, 1
-        st      r4, [@running_on_hw]
-
         ; setup "current" tsk and optionally cache it in dedicated r25
         mov     r9, @init_task
         SET_CURR_TASK_ON_CPU  r9, r0    ; r9 = tsk, r0 = scratch
diff --git a/arch/arc/kernel/kgdb.c b/arch/arc/kernel/kgdb.c
index a2ff5c5d1450..ecf6a7869375 100644
--- a/arch/arc/kernel/kgdb.c
+++ b/arch/arc/kernel/kgdb.c
@@ -158,11 +158,6 @@ int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
         return -1;
 }
 
-unsigned long kgdb_arch_pc(int exception, struct pt_regs *regs)
-{
-        return instruction_pointer(regs);
-}
-
 int kgdb_arch_init(void)
 {
         single_step_data.armed = 0;
diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c
index b9a5685a990e..ae1c485cbc68 100644
--- a/arch/arc/kernel/perf_event.c
+++ b/arch/arc/kernel/perf_event.c
@@ -244,25 +244,23 @@ static int arc_pmu_device_probe(struct platform_device *pdev)
                 pr_err("This core does not have performance counters!\n");
                 return -ENODEV;
         }
+        BUG_ON(pct_bcr.c > ARC_PMU_MAX_HWEVENTS);
 
-        arc_pmu = devm_kzalloc(&pdev->dev, sizeof(struct arc_pmu),
-                               GFP_KERNEL);
+        READ_BCR(ARC_REG_CC_BUILD, cc_bcr);
+        if (!cc_bcr.v) {
+                pr_err("Performance counters exist, but no countable conditions?\n");
+                return -ENODEV;
+        }
+
+        arc_pmu = devm_kzalloc(&pdev->dev, sizeof(struct arc_pmu), GFP_KERNEL);
         if (!arc_pmu)
                 return -ENOMEM;
 
         arc_pmu->n_counters = pct_bcr.c;
-        BUG_ON(arc_pmu->n_counters > ARC_PMU_MAX_HWEVENTS);
-
         arc_pmu->counter_size = 32 + (pct_bcr.s << 4);
-        pr_info("ARC PMU found with %d counters of size %d bits\n",
-                arc_pmu->n_counters, arc_pmu->counter_size);
-
-        READ_BCR(ARC_REG_CC_BUILD, cc_bcr);
-
-        if (!cc_bcr.v)
-                pr_err("Strange! Performance counters exist, but no countable conditions?\n");
 
-        pr_info("ARC PMU has %d countable conditions\n", cc_bcr.c);
+        pr_info("ARC perf\t: %d counters (%d bits), %d countable conditions\n",
+                arc_pmu->n_counters, arc_pmu->counter_size, cc_bcr.c);
 
         cc_name.str[8] = 0;
         for (i = 0; i < PERF_COUNT_HW_MAX; i++)
diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index 119dddb752b2..252bf603db9c 100644
--- a/arch/arc/kernel/setup.c
+++ b/arch/arc/kernel/setup.c
@@ -13,7 +13,9 @@
 #include <linux/console.h>
 #include <linux/module.h>
 #include <linux/cpu.h>
+#include <linux/clk-provider.h>
 #include <linux/of_fdt.h>
+#include <linux/of_platform.h>
 #include <linux/cache.h>
 #include <asm/sections.h>
 #include <asm/arcregs.h>
@@ -24,11 +26,10 @@
 #include <asm/unwind.h>
 #include <asm/clk.h>
 #include <asm/mach_desc.h>
+#include <asm/smp.h>
 
 #define FIX_PTR(x)  __asm__ __volatile__(";" : "+r"(x))
 
-int running_on_hw = 1;  /* vs. on ISS */
-
 /* Part of U-boot ABI: see head.S */
 int __initdata uboot_tag;
 char __initdata *uboot_arg;
@@ -42,26 +43,26 @@ struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
 static void read_arc_build_cfg_regs(void)
 {
         struct bcr_perip uncached_space;
+        struct bcr_generic bcr;
         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
         FIX_PTR(cpu);
 
         READ_BCR(AUX_IDENTITY, cpu->core);
+        READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);
 
-        cpu->timers = read_aux_reg(ARC_REG_TIMERS_BCR);
+        READ_BCR(ARC_REG_TIMERS_BCR, cpu->timers);
         cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
 
         READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
         cpu->uncached_base = uncached_space.start << 24;
 
-        cpu->extn.mul = read_aux_reg(ARC_REG_MUL_BCR);
-        cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR);
-        cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR);
-        cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR);
-        cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR);
-        READ_BCR(ARC_REG_MAC_BCR, cpu->extn_mac_mul);
+        READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
 
-        cpu->extn.ext_arith = read_aux_reg(ARC_REG_EXTARITH_BCR);
-        cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR);
+        cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */
+        cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */
+        cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0;        /* 1,3 */
+        cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0;
+        cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */
 
         /* Note that we read the CCM BCRs independent of kernel config
          * This is to catch the cases where user doesn't know that
@@ -95,43 +96,76 @@ static void read_arc_build_cfg_regs(void)
         read_decode_mmu_bcr();
         read_decode_cache_bcr();
 
-        READ_BCR(ARC_REG_FP_BCR, cpu->fp);
-        READ_BCR(ARC_REG_DPFP_BCR, cpu->dpfp);
+        {
+                struct bcr_fp_arcompact sp, dp;
+                struct bcr_bpu_arcompact bpu;
+
+                READ_BCR(ARC_REG_FP_BCR, sp);
+                READ_BCR(ARC_REG_DPFP_BCR, dp);
+                cpu->extn.fpu_sp = sp.ver ? 1 : 0;
+                cpu->extn.fpu_dp = dp.ver ? 1 : 0;
+
+                READ_BCR(ARC_REG_BPU_BCR, bpu);
+                cpu->bpu.ver = bpu.ver;
+                cpu->bpu.full = bpu.fam ? 1 : 0;
+                if (bpu.ent) {
+                        cpu->bpu.num_cache = 256 << (bpu.ent - 1);
+                        cpu->bpu.num_pred = 256 << (bpu.ent - 1);
+                }
+        }
+
+        READ_BCR(ARC_REG_AP_BCR, bcr);
+        cpu->extn.ap = bcr.ver ? 1 : 0;
+
+        READ_BCR(ARC_REG_SMART_BCR, bcr);
+        cpu->extn.smart = bcr.ver ? 1 : 0;
+
+        cpu->extn.debug = cpu->extn.ap | cpu->extn.smart;
 }
 
 static const struct cpuinfo_data arc_cpu_tbl[] = {
-        { {0x10, "ARCTangent A5"}, 0x1F},
         { {0x20, "ARC 600"      }, 0x2F},
         { {0x30, "ARC 700"      }, 0x33},
         { {0x34, "ARC 700 R4.10"}, 0x34},
+        { {0x35, "ARC 700 R4.11"}, 0x35},
         { {0x00, NULL           } }
 };
 
+#define IS_AVAIL1(v, str)       ((v) ? str : "")
+#define IS_USED(cfg)            (IS_ENABLED(cfg) ? "" : "(not used) ")
+#define IS_AVAIL2(v, str, cfg)  IS_AVAIL1(v, str), IS_AVAIL1(v, IS_USED(cfg))
+
 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
 {
-        int n = 0;
         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
         struct bcr_identity *core = &cpu->core;
         const struct cpuinfo_data *tbl;
-        int be = 0;
-#ifdef CONFIG_CPU_BIG_ENDIAN
-        be = 1;
-#endif
+        char *isa_nm;
+        int i, be, atomic;
+        int n = 0;
+
         FIX_PTR(cpu);
 
+        {
+                isa_nm = "ARCompact";
+                be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
+
+                atomic = cpu->isa.atomic1;
+                if (!cpu->isa.ver)      /* ISA BCR absent, use Kconfig info */
+                        atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
+        }
+
         n += scnprintf(buf + n, len - n,
-                       "\nARC IDENTITY\t: Family [%#02x]"
-                       " Cpu-id [%#02x] Chip-id [%#4x]\n",
-                       core->family, core->cpu_id,
-                       core->chip_id);
+                       "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
+                       core->family, core->cpu_id, core->chip_id);
 
         for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
                 if ((core->family >= tbl->info.id) &&
                     (core->family <= tbl->up_range)) {
                         n += scnprintf(buf + n, len - n,
-                                       "processor\t: %s %s\n",
-                                       tbl->info.str,
-                                       be ? "[Big Endian]" : "");
+                                       "processor [%d]\t: %s (%s ISA) %s\n",
+                                       cpu_id, tbl->info.str, isa_nm,
+                                       IS_AVAIL1(be, "[Big-Endian]"));
                         break;
                 }
         }
@@ -143,34 +177,35 @@ static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
                        (unsigned int)(arc_get_core_freq() / 1000000),
                        (unsigned int)(arc_get_core_freq() / 10000) % 100);
 
-        n += scnprintf(buf + n, len - n, "Timers\t\t: %s %s\n",
-                       (cpu->timers & 0x200) ? "TIMER1" : "",
-                       (cpu->timers & 0x100) ? "TIMER0" : "");
+        n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ",
+                       IS_AVAIL1(cpu->timers.t0, "Timer0 "),
+                       IS_AVAIL1(cpu->timers.t1, "Timer1 "),
+                       IS_AVAIL2(cpu->timers.rtsc, "64-bit RTSC ", CONFIG_ARC_HAS_RTSC));
 
-        n += scnprintf(buf + n, len - n, "Vect Tbl Base\t: %#x\n",
-                       cpu->vec_base);
+        n += i = scnprintf(buf + n, len - n, "%s%s",
+                           IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC));
 
-        n += scnprintf(buf + n, len - n, "UNCACHED Base\t: %#x\n",
-                       cpu->uncached_base);
+        if (i)
+                n += scnprintf(buf + n, len - n, "\n\t\t: ");
 
-        return buf;
-}
+        n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
+                       IS_AVAIL1(cpu->extn_mpy.ver, "mpy "),
+                       IS_AVAIL1(cpu->extn.norm, "norm "),
+                       IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
+                       IS_AVAIL1(cpu->extn.swap, "swap "),
+                       IS_AVAIL1(cpu->extn.minmax, "minmax "),
+                       IS_AVAIL1(cpu->extn.crc, "crc "),
+                       IS_AVAIL2(1, "swape", CONFIG_ARC_HAS_SWAPE));
 
-static const struct id_to_str mul_type_nm[] = {
-        { 0x0, "N/A"},
-        { 0x1, "32x32 (spl Result Reg)" },
-        { 0x2, "32x32 (ANY Result Reg)" }
-};
+        if (cpu->bpu.ver)
+                n += scnprintf(buf + n, len - n,
+                              "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
+                              IS_AVAIL1(cpu->bpu.full, "full"),
+                              IS_AVAIL1(!cpu->bpu.full, "partial"),
+                              cpu->bpu.num_cache, cpu->bpu.num_pred);
 
-static const struct id_to_str mac_mul_nm[] = {
-        {0x0, "N/A"},
-        {0x1, "N/A"},
-        {0x2, "Dual 16 x 16"},
-        {0x3, "N/A"},
-        {0x4, "32x16"},
-        {0x5, "N/A"},
-        {0x6, "Dual 16x16 and 32x16"}
-};
+        return buf;
+}
 
 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
 {
@@ -178,67 +213,46 @@ static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 
         FIX_PTR(cpu);
-#define IS_AVAIL1(var, str)     ((var) ? str : "")
-#define IS_AVAIL2(var, str)     ((var == 0x2) ? str : "")
-#define IS_USED(cfg)            (IS_ENABLED(cfg) ? "(in-use)" : "(not used)")
 
         n += scnprintf(buf + n, len - n,
-                       "Extn [700-Base]\t: %s %s %s %s %s %s\n",
-                       IS_AVAIL2(cpu->extn.norm, "norm,"),
-                       IS_AVAIL2(cpu->extn.barrel, "barrel-shift,"),
-                       IS_AVAIL1(cpu->extn.swap, "swap,"),
-                       IS_AVAIL2(cpu->extn.minmax, "minmax,"),
-                       IS_AVAIL1(cpu->extn.crc, "crc,"),
-                       IS_AVAIL2(cpu->extn.ext_arith, "ext-arith"));
-
-        n += scnprintf(buf + n, len - n, "Extn [700-MPY]\t: %s",
-                       mul_type_nm[cpu->extn.mul].str);
-
-        n += scnprintf(buf + n, len - n, "   MAC MPY: %s\n",
-                       mac_mul_nm[cpu->extn_mac_mul.type].str);
-
-        if (cpu->core.family == 0x34) {
-                n += scnprintf(buf + n, len - n,
-                "Extn [700-4.10]\t: LLOCK/SCOND %s, SWAPE %s, RTSC %s\n",
-                               IS_USED(CONFIG_ARC_HAS_LLSC),
-                               IS_USED(CONFIG_ARC_HAS_SWAPE),
-                               IS_USED(CONFIG_ARC_HAS_RTSC));
-        }
-
-        n += scnprintf(buf + n, len - n, "Extn [CCM]\t: %s",
-                       !(cpu->dccm.sz || cpu->iccm.sz) ? "N/A" : "");
-
-        if (cpu->dccm.sz)
-                n += scnprintf(buf + n, len - n, "DCCM: @ %x, %d KB ",
-                               cpu->dccm.base_addr, TO_KB(cpu->dccm.sz));
-
-        if (cpu->iccm.sz)
-                n += scnprintf(buf + n, len - n, "ICCM: @ %x, %d KB",
+                       "Vector Table\t: %#x\nUncached Base\t: %#x\n",
+                       cpu->vec_base, cpu->uncached_base);
+
+        if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
+                n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
+                               IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
+                               IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
+
+        if (cpu->extn.debug)
+                n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n",
+                               IS_AVAIL1(cpu->extn.ap, "ActionPoint "),
+                               IS_AVAIL1(cpu->extn.smart, "smaRT "),
+                               IS_AVAIL1(cpu->extn.rtt, "RTT "));
+
+        if (cpu->dccm.sz || cpu->iccm.sz)
+                n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
+                               cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
                                cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
 
-        n += scnprintf(buf + n, len - n, "\nExtn [FPU]\t: %s",
-                       !(cpu->fp.ver || cpu->dpfp.ver) ? "N/A" : "");
-
-        if (cpu->fp.ver)
-                n += scnprintf(buf + n, len - n, "SP [v%d] %s",
-                               cpu->fp.ver, cpu->fp.fast ? "(fast)" : "");
-
-        if (cpu->dpfp.ver)
-                n += scnprintf(buf + n, len - n, "DP [v%d] %s",
-                               cpu->dpfp.ver, cpu->dpfp.fast ? "(fast)" : "");
-
-        n += scnprintf(buf + n, len - n, "\n");
-
         n += scnprintf(buf + n, len - n,
                        "OS ABI [v3]\t: no-legacy-syscalls\n");
 
         return buf;
 }
 
-static void arc_chk_ccms(void)
+static void arc_chk_core_config(void)
 {
-#if defined(CONFIG_ARC_HAS_DCCM) || defined(CONFIG_ARC_HAS_ICCM)
         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
+        int fpu_enabled;
+
+        if (!cpu->timers.t0)
+                panic("Timer0 is not present!\n");
+
+        if (!cpu->timers.t1)
+                panic("Timer1 is not present!\n");
+
+        if (IS_ENABLED(CONFIG_ARC_HAS_RTSC) && !cpu->timers.rtsc)
+                panic("RTSC is not present\n");
 
 #ifdef CONFIG_ARC_HAS_DCCM
         /*
@@ -256,33 +270,20 @@ static void arc_chk_ccms(void)
         if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
                 panic("Linux built with incorrect ICCM Size\n");
 #endif
-#endif
-}
 
-/*
- * Ensure that FP hardware and kernel config match
- * -If hardware contains DPFP, kernel needs to save/restore FPU state
- *  across context switches
- * -If hardware lacks DPFP, but kernel configured to save FPU state then
- *  kernel trying to access non-existant DPFP regs will crash
- *
- * We only check for Dbl precision Floating Point, because only DPFP
- * hardware has dedicated regs which need to be saved/restored on ctx-sw
- * (Single Precision uses core regs), thus kernel is kind of oblivious to it
- */
-static void arc_chk_fpu(void)
-{
-        struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
+        /*
+         * FP hardware/software config sanity
+         * -If hardware contains DPFP, kernel needs to save/restore FPU state
+         * -If not, it will crash trying to save/restore the non-existant regs
+         *
+         * (only DPDP checked since SP has no arch visible regs)
+         */
+        fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
 
-        if (cpu->dpfp.ver) {
-#ifndef CONFIG_ARC_FPU_SAVE_RESTORE
-                pr_warn("DPFP support broken in this kernel...\n");
-#endif
-        } else {
-#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
-                panic("H/w lacks DPFP support, apps won't work\n");
-#endif
-        }
+        if (cpu->extn.fpu_dp && !fpu_enabled)
+                pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
+        else if (!cpu->extn.fpu_dp && fpu_enabled)
+                panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
 }
 
 /*
@@ -303,15 +304,11 @@ void setup_processor(void)
 
         arc_mmu_init();
         arc_cache_init();
-        arc_chk_ccms();
 
         printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
-
-#ifdef CONFIG_SMP
         printk(arc_platform_smp_cpuinfo());
-#endif
 
-        arc_chk_fpu();
+        arc_chk_core_config();
 }
 
 static inline int is_kernel(unsigned long addr)
@@ -360,11 +357,7 @@ void __init setup_arch(char **cmdline_p)
                 machine_desc->init_early();
 
         setup_processor();
-
-#ifdef CONFIG_SMP
         smp_init_cpus();
-#endif
-
         setup_arch_memory();
 
         /* copy flat DT out of .init and then unflatten it */
@@ -385,7 +378,13 @@ void __init setup_arch(char **cmdline_p)
 
 static int __init customize_machine(void)
 {
-        /* Add platform devices */
+        of_clk_init(NULL);
+        /*
+         * Traverses flattened DeviceTree - registering platform devices
+         * (if any) complete with their resources
+         */
+        of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+
         if (machine_desc->init_machine)
                 machine_desc->init_machine();
 
@@ -419,19 +418,14 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 
         seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 
-        seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n",
+        seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
                    loops_per_jiffy / (500000 / HZ),
                    (loops_per_jiffy / (5000 / HZ)) % 100);
 
         seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
-
         seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
-
         seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
-
-#ifdef CONFIG_SMP
         seq_printf(m, arc_platform_smp_cpuinfo());
-#endif
 
         free_page((unsigned long)str);
 done:
diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c
index dcd317c47d09..d01df0c517a2 100644
--- a/arch/arc/kernel/smp.c
+++ b/arch/arc/kernel/smp.c
@@ -101,7 +101,7 @@ void __weak arc_platform_smp_wait_to_boot(int cpu)
 
 const char *arc_platform_smp_cpuinfo(void)
 {
-        return plat_smp_ops.info;
+        return plat_smp_ops.info ? : "";
 }
 
 /*